Stansbury Hagar (December 9, 1869, in San Francisco, California[1]-December 23, 1942, in New York City[2]) was an ethnologist from the United States and an authority upon Peruvian astronomy.[3] He graduated in 1892 (Bachelor of Arts) from Yale University and in 1897 (Bachelor of Laws) from New York Law School. He was a member of many scientific societies.[3]